I created a simple power supply as shown below that results in an unregulated 50VDC which is what I desire. The transformer is rated for 1000VA. It works ... but only if you're lucky enough to turn it on at the right time of the AC cycle to not pop the breaker. Clearly I need to limit the inrush current on those capacitors.
I was looking at putting an NTC Termistor in series, probably between the transformer secondary and the bridge rectifier. Specifically SL22 5R012 which is 5 ohms at room temperature, can do 12A at steady state, and can survive 100J.
The problem I foresee however is the load connected to this supply is not constant. The load is DC solenoids that could not be activated for a significant amount of time (minutes to hours). That would mean the NTC would likely cool down correct? I don't know if the capacitors would be enough for the NTC to reheat when demand is needed. There would never be a constant load on the supply, aside from the bleeder resistors which is pretty low.
I've heard of having a relay or MOSFET to bypass an NTC or regular resistor after X seconds, but unsure how to implement it with only the 50V available.